Electrical Power System Analysis
Mostrando 25-36 de 83 artigos, teses e dissertações.
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25. Contribuições ao processo computacional para análise de pedidos de indenização por danos em equipamentos elétricos
The increasing number of refunding requests related to electrical and electronic equipment damages has attracted the attention of the electric utilities, consumers, regulatory and other government agencies. Such concerns are not associated only with the financial contents involved, but especially with the social impacts associated to requests, decisions, con
Publicado em: 2010
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26. DECISION SUPPORT SYSTEM FOR THE DIAGNOSIS OF FAULTS IN POWER TRANSFORMERS / SISTEMA DE APOIO À DECISÃO PARA O DIAGNÓSTICO DE FALTAS EM TRANSFORMADORES DE POTÊNCIA
Given the complexity of the Brazilian energy matrix and in particular of the whole interconnected electrical power system, it is essential to ensure that the equipment, from generation to final consumers, operates in a satisfactory way and high levels of reliability. In accordance with the restructuring of the sector and its integration in a competitive mark
Publicado em: 2009
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27. Dynamic response of three-phase induction motors to voltage sags in the power supply network / Resposta dinâmica dos motores de indução trifásicos a afundamentos de tensão na rede de alimentação
This research shows a study on the dynamic response of three-phase induction motors submitted to voltage sags. Computer simulations about a distribution system, as well as the modeling of three-phase induction motors based on actual data, were made using ATP (Alternative Transients Program) software. These simulations intended to generate representative situ
Publicado em: 2009
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28. Contribution to the surge arresters´ evaluation methodology of electrical transmission system. / Contribuição à metodologia de avaliação dos pára-raios do sistema de transmissão de energia elétrica
Power systems are subject to many types of overvoltages that may provoke interruptions or damage in electrical equipments, compromising the continuity of electrical energy supply to consumers and impacting negatively the power quality indices. One of the most important device used to protect the electric equipments are the surge arresters, which may be class
Publicado em: 2009
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29. An analysis of energetic balance of a biogasproducing System in a swine farm: implementation of a computational device / Análise de balanço energético de sistema de produção de biogás em granja de suínos: implementação de aplicativo computacional
The development of swine breeding made evident the need for greater attention to the issue of treatment and destination of swine wastes. Among the alternatives for environmental sanitation, the most advantageous one shows to be the biodigesters, since they add value to the process by means of the by-products generated: biogas, mainly made out of methane and
Publicado em: 2009
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30. Metodo baseado em logica nebulosa para alocação de geradores distribuidos sob a optica do perfil de tensão / Method based on fuzzy logic for allocating distributed generators from the viewpoint of the voltage profile
This work consists in proposing a methodology based on Fuzzy Logic to obtain an index, which classifies the buses more suitable to install a distributed generator in an electric power distribution system. Themethodologywas developed taking into consideration the difficulty tomaintain a suitable voltage profile in distribution systems, so the methodology resu
Publicado em: 2009
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31. ANÁLISE ECONÔMICA E BALANÇO ENERGÉTICO DO BIOGÁS EM GRANJAS DE SUÍNOS / ECONOMIC ANALYSIS AND ENERGY BALANCE OF PLANTS IN FARMS DE PIGS
This work presents a case analysis of energetic harnessing in a piggery, based on the use of biogas generated from pig sewage. The analysis shows that the energy from the biogas produced in the farm processes can be partially used through Clean Development Mechanisms (CDM) in order to improve the system efficiency. The utilized process presents environmental
Publicado em: 2009
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32. Analise dos sistemas de proteção e controle de instalações industriais com geradores sincronos durante operação ilhada / Protection and control systems analysis of industrial plants with synchronous generators during islanded operation
Modern industrial systems are very sophisticated installations with a high number of automatic processes and capability of isolated (islanded) operation after contingences by using onsite generators composed mainly by synchronous machines and steam turbines. Such installations, in the presence of generators, are generically called autoproducers. Since many o
Publicado em: 2009
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33. AVALIAÇÃO DO REFORÇO DAS CONDIÇÕES DA SEGURANÇA DE TENSÃO UTILIZANDO A ANÁLISE DE SENSIBILIDADE
Durante décadas, problemas relacionados à estabilidade de tensão ou, segurança de tensão, têm despertada a atenção crescente de pesquisadores do setor elétrico. O crescimento da economia e o aumento do consumo de energia elétrica, aliados à falta de investimentos nos setores de geração e transmissão, têm levado o sistema elétrico de potência
Publicado em: 2009
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34. Avaliação dos Impactos da Impedância de Falta e da Geração Distribuída em Estudos de Afundamentos de Tensão / Impact Assessment of Fault Impedance and Distributed Generation Studies of Voltage Sags
This work presents an impact analysis of the fault impedance and distributed ge- neration on the amplitude and annual average quantity of voltage sags in sensitive end-users. Phase-to-ground solid and non-solid faults were simulated in 62 transmission lines at 230, 138, 69 and 13.8 kV, which made part of the electrical system of the municipality of Goiânia,
Publicado em: 2009
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35. Optimum design applied to electrooptic modulators / Projeto ótimo de moduladores eletroópticos
Many design developments involve the optimization of several objective functions. These objective functions are often conflicting with each other and they cannot be simply aggregated into only one function to be optimized. This type of problem is known as the multiobjective optimization problem, for which the solution is a set of points known as Pareto optim
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/02/2008
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36. Analise de viabilidade de troca de motores eletricos superdimensionados e a influencia da energia reativa / Analysis of feasibility of the change of super dimensioned electrical engines and the influence of reactive energy
This study shows the importance of the electrical engine of triphasic induction rotor (squirrel cage), which is the main responsible for the waste of electrical energy in industry; it presents its electrical and mechanical characteristics and its evolution along the years, as well. The study describes the problem of the super dimensioning of these engines th
Publicado em: 2008